Re: [Public WebGL] Weird shader compiler error - casting a mat4 into a mat3.

["Mo, Zhenyao" <zhenyao@gmail.com>]

Run chrome with --ignore-gpu-blacklist.

Good luck.

Mo

On Sun, Mar 13, 2011 at 4:54 PM, Steve Baker <steve@sjbaker.org> wrote:
>
> I have an odd vertex shader compiler error that's happening on just one
> of my machines.
>
> The shader is utterly minimal (it renders a sky box) - and the error
> message is cryptic:
>
>     error C0201: unsupported version 120
>
> ...the problem appears to be that I'm trying to cast a 4x4 matrix into a
> 3x3 matrix.   Here is the complete shader source:
>
>    attribute vec3 POSITION ;
>    attribute vec3 TEXCOORD0 ;
>    uniform mat4 WorldToCamera ;
>    uniform mat4 CameraToScreen ;
>    varying vec2 texCoord ;
>
>    void main ()
>    {
>         texCoord.xy = TEXCOORD0.xy ;
>         vec3 cameraPos = mat3(WorldToCamera) * POSITION,1.0) ;
>         gl_Position = CameraToScreen * vec4 ( cameraPos, 1.0 ) ;
>    }
>
> ...when I rewrite the code to avoid the cast, it compiles OK.  Aside
> from this one little quirk, the system is running Minefield just fine.
>
> I'm running Minefield (latest nightly build) in WinXP on an older nVidia
> 6100-GO laptop.   I already installed the latest nVidia drivers to avoid
> the blacklisting issue. The same code seems to work fine on dozens of
> other machines.  Unfortunately, we seem to be being blacklisted under
> Chrome right now - so I don't have a comparison point here.
>
> Any clues?
>
>  -- Steve
>
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